*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19912
19921
19933
199413
19953
19963
19970
19982
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20097
201023
201116
201223
201321
201412
201514
201611
20170
20180
20190
20200
20210
20223
20230
20241
Total159