And Israel was not a nation for most of those dates you bring up.
Don’t recall 2011. What Christians place emphasis on the Mayan calendar?
A nation is an ethnic group.
Israel was a nation even after it lost its political status in 40 BC ~ 40 AD.
If you mean a political country as the modern state of Israel - that has been the case since 1948.
So then 4 of the 6 dates are since 1948
1988
1989
2011
2012
2011 was Harold Camping