*Excludes Observations that spanned multiple years

Pre 197012
19701
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19821
19830
19847
19850
198611
198714
198818
198916
199017
199115
199213
199310
199412
199513
199619
199713
199810
199910
20008
200111
20025
20038
20047
20057
20065
20076
20085
20094
20106
20119
20128
20137
20146
20157
20165
20175
20184
20197
20204
20214
20222
20230
20240
Total353