*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19821
19830
19841
19853
19860
19870
19880
19890
19900
19913
19921
19931
19940
19950
199615
19972
19980
19990
20000
20013
20021
20030
20040
20051
20060
20070
20080
20090
20100
20110
20120
20132
20140
20150
20161
20172
20181
20191
20200
20210
20220
20230
20242
Total42