*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19882
19890
19900
19911
19922
19936
19942
19956
19960
19970
19980
19990
20001
20010
20020
20030
20040
20050
20060
20070
20081
20092
20105
20112
20121
20133
20146
20150
20164
201710
20183
20190
20200
20210
20220
20230
20240
Total59