*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000516
1970000000
1971000000
1972000000
1973000101
1974000000
1975000000
1976000101
1977000404
1978000101
1979001405
1980000303
1981000505
1982000404
1983000101
1984000000
1985000303
1986001214
1987000909
1988002518
198900110718
1990000201434
1991005181033
199200020626
1993000191635
1994000251742
199500731947
1996002162543
1997003422772
1998000401959
199900236947
200000283893
20010021179128
20020031133119
20030021053110
2004002691182
20050018721109
200600177987
2007000821294
2008002967105
20090021297138
201000013114145
201100216821191
201200112512138
201300059362
201400030636
201500012315
2016000202
2017000000
2018000000
Total004418103112165