*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19840
19850
19860
19871
19882
19891
19901
19916
19927
199315
19942
19956
19961
19970
19981
19993
20000
20013
20021
20031
20048
20050
20065
20075
20082
20097
2010343
20119
20127
20138
201410
2015299
2016108
201792
201880
201997
20200
20210
20220
Total1134