*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000000
1971000000
1972000202
1973000000
1974000000
1975000202
1976000202
1977000404
1978000101
1979000202
1980000202
1981000303
1982100708
1983000303
1984000505
1985000213
1986000448
198700010717
1988000347
19890008412
1990000121628
1991003272050
1992001231034
1993005231442
1994004503791
1995004562484
1996002682494
199710106929109
19980049334131
1999002491566
200000311048161
20010042009213
200200317036209
200300325766326
200400514783235
2005003120113236
200600215669227
200700114563209
200800212687215
200900315029182
201000126078339
201110319669269
201200211656174
201300211317132
201400910020129
2015000351146
201600151723
2017000011
2018000000
Total3082293811154138