*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19910
19922
19933
19943
19950
19960
19970
19980
19990
20000
20012
20020
20032
20041
20052
20061
20071
20082
20090
20102
20111
20120
20134
20140
20150
20160
20171
20180
20190
20200
20210
20220
20230
20240
Total28