*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19920
19933
19940
19950
19961
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20070
20080
20090
20100
20110
20120
20131
20140
20152
20163
20170
20181
20191
20203
20210
20220
20231
20240
Total20