Italy - 58 + 2022 nomination pending
(39 tentative nominations - last update 21/05/2021)

China - 56 + 2022 nomination pending
(59 tentative nominations - last update 30/01/2019)

Germany - 51 + 2022 nomination pending
(7 tentative nominations - last update 15/02/2015)

Spain - 49 + 2022 nomination pending
(30 tentative nominations - last update 25/01/2021)

France - 49 + 2022 nomination pending
(34 tentative nominations - last update 25/01/2021)

India - 40 + 2022 nomination pending
(46 tentative nominations - last update 13/04/2021)

Mexico - 35
(21 tentative nominations - last update 07/11/2018)

United Kingdom - 33
(8 tentative nominations - last update 27/01/2012)

Russian Federation - 30 + 2022 nomination pending
(27 tentative nominations - last update 12/03/2021)

Iran (Islamic Republic of) - 26 + 2022 nomination pending
(55 tentative nominations - last update 30/09/2020)

Japan - 25
(5 tentative nominations - last update 01/02/2016)

United States of America - 24
(19 tentative nominations - last update 12/04/2017)

Brazil - 23
(21 tentative nominations - last update 07/06/2017)

Canada - 20 + 2022 nomination pending
(11 tentative nominations - last update 13/04/2018)

Australia - 20
(4 tentative nominations - last update 15/04/2021)

Turkey - 19 + 2022 nomination pending
(84 tentative nominations - last update 15/04/2021)

Greece - 18
(14 tentative nominations - last update 16/01/2014)

Portugal - 17 + 2022 nomination pending
(19 tentative nominations - last update 06/06/2017)

Poland - 17
(5 tentative nominations - last update 24/10/2019)

Czechia - 16 + 2022 nomination pending
(14 tentative nominations - last update 16/07/2020)

Sweden - 15
(1 tentative nomination - last update 02/12/2009)

Republic of Korea - 15 + 2022 nomination pending
(12 tentative nominations - last update 28/01/2019)

Belgium - 15
(16 tentative nominations - last update 03/04/2019)

Switzerland - 13
(2 tentative nominations - last update 28/02/2018)

Peru - 13
(23 tentative nominations - last update 05/08/2019)

Netherlands - 12
(3 tentative nominations - last update 01/12/2015)

Austria - 12
(10 tentative nominations - last update 12/01/2016)

Argentina - 11
(10 tentative nominations - last update 01/02/2019)

South Africa - 10
(5 tentative nominations - last update 15/04/2015)

Denmark - 10 + 2022 nomination pending
(4 tentative nominations - last update 31/01/2019)

Croatia - 10
(15 tentative nominations - last update 31/01/2020)

Bulgaria - 10
(16 tentative nominations - last update 31/01/2020)

Observations:
- Only 13 of 32 leading countries by inscriptions are outside Europe
- Potentially 5 countries may reach 50 inscriptions in 2022
- 6 leading countries in inscriptions all have nominations submitted for 2022
- 18 of 32 leading countries have made updates to their tentative list (large or small) since January 2019
- Germany (official 2024-25) is "in the process" of updating their tentative list
- Japan (official 2021-2022) is "in the process" of updating their tentative list
- With the exception of France's 2022 nomination, the leading countries submitted cultural sites only
- 2/3 of all world heritage sites (772) come from these 32 countries
- 1/3 of all current tentative nominations come from these 32 countries

winterkjm
Yep I see that too. I take the corona crisis to tick off Europe sights now. I think averaging 10 per month for a full year works as a minimum. At least, I have 10-15 trips "planned, not booked" all 7-10 days which tick-off more than that.
I concentrated a lot on far away sites in the past. Also countries that I guess won't have more anyway.