*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000303
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000101
1982000011
1983000000
1984000022
1985000101
1986000202
1987000011
1988000213
1989000000
1990000145
1991000156
1992000101
1993000123
199400014344
199500014142
199600013132
199700031114
199800023436
199900045054
200000026062
20010008412
2002000117182
200300038992
200400047276
200500031215
200600065763
200700010123133
200800076875
200900032124
2010000143347
2011000112536
2012000155368
2013000111526
20140011131133
2015001203
2016000101
2017000011
2018000000
Total00213710611200