*Excludes Observations that spanned multiple years

Pre 19702
19701
19711
19720
19731
19740
19750
19760
19772
19783
19792
19803
19810
19820
19830
19840
19853
198615
19879
1988137
198919
199012
199139
199275
199351
199420
199557
199611
199729
199820
199937
200055
200139
200216
20037
200457
200559
200624
200766
200813
200918
20104
201115
201215
201313
20148
20153
201625
201731
201837
201949
202034
202157
202226
20231
20240
Total1221