*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
19952
19960
19970
19980
19990
20000
20011
20020
20030
20042
20050
20060
20070
20080
20090
20100
20110
20120
20130
20141
20150
20160
20170
20181
20191
20203
20211
20220
20230
20240
Total18