*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000718
1970000303
1971000000
1972000000
1973000000
1974000101
1975000101
1976000213
1977000404
1978000606
1979000639
1980000527
1981000404
1982000404
1983000202
1984000101
1985000303
1986000224
1987001214
198800113418
198900181120
199000292031
19910084719
19920007512
1993001201435
1994000224062
199500110107118
1996006144969
199700013572585
199800433401438
199900120447468
200000015445460
20010019329339
200200043528571
200300136753790
200400046567613
200500360474537
2006006118589713
200700350490543
200800258297357
200900296388486
201000365442510
2011003117464584
2012004116794914
201300078236314
201400039141180
2015000194261
201600015116
2017000000
2018000000
Total0054120686679927