*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19851
19862
19870
19881
19890
19900
19912
19922
19931
19940
19950
19960
19970
19983
19990
20000
20010
20021
20030
20041
20050
20060
20070
20080
20090
20104
20112
20120
20130
20140
20150
20160
20170
20180
20199
20200
20215
20223
20236
20240
Total44