*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100214
1970000112
1971000022
1972000000
1973000022
1974000000
1975000202
1976000202
1977000213
1978000156
1979000167
1980001348
1981001337
1982000145
1983000202
1984000202
1985000202
1986000325
1987000617
1988000145
19890007310
199000031215
19910064515
199210271020
1993000131528
1994004152847
19950010161541
1996005272153
199700282269119
1998006115572
1999004284274
20000037213896
2001106143859
2002002324074
2003004153958
2004004305387
2005004263969
2006002314275
2007001303465
2008001302051
2009004472778
2010001492171
2011001391353
2012000152035
201300039847
2014000281038
2015000221335
201600013013
2017000505
2018000000
Total301346737661576