*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197010102426
1970000011
1971000044
1972000033
1973000044
1974000033
1975003069
19760210710
1977031037
1978010067
1979010056
1980000077
1981000099
19820030912
1983000088
198400001212
198500001212
198601001112
19870150713
198801501117
198901301014
1990121001124
199112240734
1992122801142
1993115401874
1994032401441
1995114101255
1996212401037
1997101601431
1998132001337
1999101211529
2000112501643
2001002001636
2002102401237
2003221301128
200412501422
2005011301630
2006011401631
2007011201427
2008102301034
2009204702170
2010405601676
201100128023151
201231115040159
2013107501288
20141170514
2015101301428
20160150814
201704101217
2018000011
2019000011
2020101002
2021000000
Total304187215651509