*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19803
19810
19820
19830
19840
19853
19865
198737
198838
198920
19904
19913
19921
19934
199410
19954
19961
19971
19980
19990
20000
20013
20020
20038
200413
20056
20065
20074
20080
20090
20101
20110
201229
20132
20142
20150
20162
20175
20181
20190
20201
20212
202210
202319
20248
Total266