*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19811
19820
19830
19840
19850
19860
19870
19881
19890
19900
19910
19922
19931
19941
19950
19961
19971
19980
19991
20000
20010
20020
20030
20040
20050
20060
20071
20080
20090
20101
20110
20120
20131
20143
20150
20160
20171
20182
20197
20200
20210
20220
20230
20240
Total37