*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970800109
1970000000
1971000000
1972000000
1973100001
1974000000
1975000000
1976200002
1977200002
1978100001
1979100102
1980000000
1981000101
1982000202
1983000022
1984400105
1985100113
1986201205
1987100416
1988401117
1989101103
199030025129
199160012220
1992501311047
1993110024
199430010316
19953027315
1996311229
1997301307
199810026229
1999200002
2000500409
200110124044
2002102418
200310141319
2004003407
200550333142
2006300508
20070035715
200800111416
2009001416
20100037818
20114009114
20127024316
20131038416
201410026770
20151045111
2016100304
2017000101
2018000000
Total89235216211553