*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19923
19930
19946
19950
19966
19970
19980
19991
20000
20011
20022
20033
20041
20051
20062
20070
20080
20090
20103
20114
20120
20131
20142
20152
20163
20171
201814
201983
20204
20213
20224
20238
20240
Total158