*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19862
19870
198822
19892
19900
19911
19922
19932
19940
19954
19964
19971
19980
19990
20000
20010
20020
20031
20041
20050
20063
20070
20080
20091
20100
20111
20123
20135
20141
20150
20160
20171
20181
20190
20200
20210
20220
Total59