*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19900
19910
19920
19932
19940
19950
19960
19970
19980
19990
20000
20010
20025
20030
20040
20050
20060
20071
20080
20090
20100
20110
20120
20130
20140
20151
20160
20170
20180
20190
20201
20210
20221
20230
20240
Total23