*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970615210042
1970001001
1971000000
1972001001
1973000000
1974008008
1975001001
1976000000
1977000000
1978012003
197964190029
1980312006
1981306160052
198223580036
19831221170050
19841110170038
19856950020
198698100027
19871915150049
19883525230083
198951190025
1990201003
19912512100047
199257413100129
1993720100037
19942329400092
199589131100113
1996128812800237
19971591335000342
19982481468700481
1999214443000288
2000180403100251
200172161200100
200285342500144
2003202351100248
20041283600137
2005142131200167
20061287700142
20071077400118
2008948200104
200961450025
20102619230068
2011153440062
2012190220041
2013701008
2014113005
20159970025
2016003003
2017000000
Total2338859691003888