*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001045
1970000011
1971000000
1972000000
1973000022
1974000000
1975000022
1976000022
1977005027
1978001001
1979002013
1980005005
19810080210
1982001034
1983003025
1984001012
1985003014
1986006028
19874150313
19881460516
19891170312
19902450213
199156120225
199204160424
199331170223
1994110180938
199544160327
199633200228
199702190728
199847160532
1999031501230
2000322401241
200163130830
200202280333
200344240840
200403190527
2005211210640
200608330849
200700360844
200802380444
200930570161
201002650168
20110011201113
201230390345
201300280230
201400150015
201501100011
2016000000
2017012003
Total498977201541064