Israel has been a nation continuously since 1400 BC or earlier.
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
Can you not tell the difference between a ethnic group and a nation with official capacities? Nothing you say and understand will make sense without this critical understanding.
Israel as a nation did not exist for +1900 years until 1948.