*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000112
1970000000
1971000000
1972000000
1973000000
1974000000
1975000101
1976000000
1977000202
1978000000
1979000000
1980000101
1981000202
1982000000
1983000000
1984000000
1985000000
1986000134
1987000202
1988000123
19890005611
199000021214
19910085720
19920004711
199300081422
1994001113345
199500091322
199600051823
199700134953
199800114446
199900183039
200000083745
200100083644
2002000113950
2003005105166
20040002382105
2005000155065
20060012383107
200700095362
2008000272148
2009002282555
2010000292554
20110004765112
20120005379132
2013000164359
201400034346
20150006814
201600012214
2017000303
2018000000
Total00204039811404