*Excludes Observations that spanned multiple years

Pre 197010
19700
19712
19720
19730
19740
19750
19760
19770
19781
19790
19801
19811
19820
19832
19840
19853
19861
198710
198817
19890
19901
19910
199212
199330
199414
19953
19962
19972
19985
199911
200038
20012
20023
20034
20042
20051
20065
20074
200817
200912
20101
20110
20121
20133
20141
20151
20167
20172
20181
20190
20204
20212
20224
20231
20240
Total244