*Excludes Observations that spanned multiple years

Pre 197010
19700
19710
19720
19730
19740
19750
19760
19771
19780
19791
19800
19811
19820
19830
19840
19850
19860
19871
19880
19890
19901
19910
19920
19931
19940
19950
19960
19970
19980
19990
20001
20010
20020
20030
20041
20050
20060
20070
20080
20091
20100
20110
20120
20130
20140
20150
20160
20170
20181
20191
20201
20211
20221
20230
20240
Total24