*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970400105
1970000000
1971000000
1972000000
1973000000
1974000101
1975200002
1976100203
1977001203
1978000101
1979000303
1980000000
1981000202
1982000303
1983000000
1984100203
1985001102
1986100214
19872019113
19882056013
198920015320
199040316225
199120415526
19924019115
199330125231
199420129234
199520429237
199630429440
199730054562
1998301681385
199950244455
200000640147
200140647057
200220454161
200330087090
200440048052
200520145048
200630052156
200730075179
20081001041106
2009101076087
201000121430155
20112041740180
201240086393
201300067168
201400032032
20150019010
2016000101
2017000000
2018000000
Total750731508541710