*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19893
19902
19914
19920
19932
19940
19950
19961
19970
19980
19990
20002
20010
20020
20030
20040
20050
20060
20070
20080
20091
20100
20110
20122
20134
20141
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total24