*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19872
19880
19893
19900
19911
19922
19930
19941
19951
19960
19970
19980
19990
20000
20010
20020
20032
20040
20050
20060
20070
20080
20091
20100
20111
20121
20130
20140
20152
20160
20170
20184
20190
20202
20215
20220
20230
20240
Total31