*Excludes Observations that spanned multiple years

Pre 197034
19700
19710
19720
19730
19743
19750
19761
19772
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19915
19922
199322
199420
199539
199620
199764
199853
199910
20008
200118
200223
20039
200436
20056
200655
20076
20080
20095
201081
201113
20123
20135
20149
20151
201635
20175
20188
20194
20206
20213
20221
20239
20244
Total628