*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19781
19793
19801
19812
19821
19832
19841
19850
19860
19871
198811
19893
19900
19912
19921
19933
19944
19953
19961
19970
19980
19990
20000
20010
20026
20032
20042
20050
20064
20070
20082
20091
20108
20118
20122
20134
20144
20153
201611
20179
201812
201963
20201
20217
20228
20231
20241
Total200