*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19900
19912
19920
19933
19940
19950
19960
19971
19980
19990
20001
20010
20021
20030
20041
20050
20060
20070
20080
20090
20100
20111
20120
20130
20140
20150
20161
20170
20180
20191
20201
20210
20223
20230
20240
Total19