*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002204
1970000101
1971000000
1972000101
1973000101
1974000202
1975000303
1976000505
1977000808
1978001405
1979000707
1980000808
1981000505
1982000808
1983000303
1984000707
1985000314
198600010111
198700012315
1988001809
198900016925
1990000154459
1991001281847
199200524837
19930011272866
199400350108161
19950092868105
1996006217198
199700621254281
199800524191220
199900224143169
200000335215253
200100526108139
20020015590146
200300056126182
200400044119163
2005002102122226
2006001118158277
2007001118116235
200800216237201
200900118641228
201000325652311
201100329556354
2012004112105221
20130028614102
20140048725116
2015006442272
2016001102
2017000000
2018000000
Total0091215923534603