*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19980
19990
20000
20010
20021
20030
20042
20050
20060
20070
20080
20090
20101
20110
20120
20130
20142
20150
20160
20172
20180
20192
20203
20210
20222
20230
20240
Total23