*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000000
1971000000
1972000101
1973000000
1974000303
1975000101
1976000112
1977101305
1978100416
1979101103
1980200002
19813005412
1982001135
1983000202
1984100203
1985100001
1986100304
1987200316
1988101204
1989300609
199011016523
1991200518
1992000111122
199340022026
199420011922
19951007715
199620010517
1997101619
19982014613
1999000819
20004007314
200110031923
2002300418
2003100304
20042003813
200510028332
2006100809
2007100528
20081007816
2009000404
20101007412
20111009010
2012100719
2013000101
2014000055
2015000213
2016000011
2017000000
2018000000
Total5016238112407