*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000303
1970000000
1971000000
1972000000
1973000000
1974000101
1975000000
1976000000
1977000101
1978000000
1979000101
1980000101
1981000101
1982000101
1983000000
1984000000
1985000101
1986000000
1987000404
1988000101
1989000404
1990001113
19910007310
1992000303
1993001506
19940078116
19950057214
199600410317
1997001528
19980037010
1999001427
2000000707
20010039113
200200411116
200300216624
200400016016
200500113216
2006002406
200700017017
200800120021
200900625132
201000834143
201100440044
2012000606
2013000606
2014000000
2015000202
2016000303
2017000000
2018000000
Total005430526385