*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000101
1971000000
1972100001
1973000101
1974000000
1975000000
1976000101
1977000101
1978000000
1979000000
1980000000
1981000011
1982000101
1983100001
1984100001
1985000202
1986000505
1987000538
1988000819
198900214420
199000471425
199100411621
199200980897
199300810425137
199400918661256
199520917027208
199600212632160
1997009384592
199800411020134
1999001221942
200000715441202
200110284592
200200413214150
2003001512828171
200400326332298
20050039527125
20060038625114
200700312027150
200800213877217
20090021023107
201010719939246
201100110251154
201200093342
2013003641784
201400239647
201500021223
201600071017
2017000011
2018000000
Total7011826387043467