*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19981
19991
20001
20012
20020
20031
20041
20053
20062
20072
20080
20090
20100
20110
20120
20133
20140
20150
20161
20177
20189
20191
20201
20213
202221
20239
20240
Total71