*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
19910
19920
19930
19943
19950
19961
19970
19980
19990
20000
20010
20022
20030
20045
20050
20061
20070
20080
20093
20101
20110
20121
20131
20140
20151
20161
20171
20180
20191
20200
20210
20221
20230
20240
Total24