*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19941
19952
19960
19970
19980
19990
20000
20011
20020
20031
20041
20050
20060
20070
20080
20090
20100
20112
20120
20132
20140
20151
20160
20171
20180
20193
20201
20214
20222
20231
20240
Total30