*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
198617
19871
198829
19894
19900
19913
19921
19930
19941
19959
19960
19975
19980
199917
20000
20010
20020
20030
20040
20050
20060
20071
20080
20091
20105
20110
20120
20130
20140
20152
20160
20171
20180
20192
20202
20215
20227
20232
20240
Total120