*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970200232348
197010132218
1971303017
1972205007
1973204006
1974205108
197540182024
197650202027
19776093523
197860352245
1979704313467
198070167131
1981120715135
198212046527
19835076422
198411055223
1985110118535
1986120149843
19871601417956
198816037172393
19891301118547
1990100524847
1991803544592
1992110844467
199312023758118
1994170261142159
1995160147513118
19961208795104
19971708922119
1998906887110
19991402239176
20002007920119
200115010732100
20021609963124
2003161101394170
20041606882112
200518091216154
2006210171722212
200721051484178
200818081748208
200970612412311
201090363074356
2011170693122400
201229031914227
201330512915152
2014005481366
201520538348
201630825440
20171045212
2018000000
Total531173632082154691