*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19883
19890
19900
19911
19922
19936
19942
19955
19960
19970
19980
19990
20000
20010
20020
20030
20043
20050
20061
20070
20080
20090
20100
20110
20120
20130
20143
20150
20161
20172
20180
20191
20202
20212
20220
20230
20240
Total36