*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970800109
1970100102
1971500005
1972100001
1973300104
1974300003
1975100203
1976600208
1977700007
1978300003
1979400105
1980600208
1981800109
198211003014
1983500005
1984600107
1985800109
1986200417
19877005416
198812003318
198960016527
19908006822
199160014929
1992707162353
19931100195484
199415033688142
1995915213268
199615043178128
19971004196699
19987041783111
1999601175276
200012074496159
2001200130100151
20029006092161
200390246178235
200490333196241
2005170155137210
200617049882201
2007140311084211
20081300110197320
2009120313528178
201050230660373
201180030542355
201212038273170
201320410936151
201410110115118
2015101701385
2016001809
2017010001
2018000000
Total368264194219354311