*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000101
1971000000
1972000000
1973000000
1974000000
1975000202
1976000011
1977001203
1978000000
1979002068
1980000358
1981000314
1982000202
1983000101
1984000112
1985000000
1986000011
1987000134
1988000369
1989000145
199000121821
1991000044
199200021820
199300022830
19940005142147
199500178189
19960034104111
19970017170178
19980084150162
1999001396100
20000027189198
20010037153163
20020018282291
200300411313328
200400113369383
20050017136144
200600024258282
200700230418450
200800624181211
200900332285320
201000850388446
201100246257305
2012003756470563
2013003144317464
201400036363399
2015000808
201600001919
2017000000
2018000000
Total009156152375889