*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19731
19740
19751
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19882
19896
19901
19918
199215
199314
199413
199521
19966
199719
19981
19990
20001
20011
20024
20034
20043
20050
20063
200711
20087
20098
20101
20117
201212
201321
201420
20156
201610
201726
201824
20194
20201
20213
20226
20236
20247
Total306