*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19900
19912
19920
19930
19940
19950
19962
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20081
20092
20101
20113
20120
20134
20142
20152
20162
20170
20180
20190
20200
20210
20221
20230
20240
Total23