*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970006017
1970000011
1971001001
1972000000
1973000022
1974000000
1975002013
1976002002
1977007018
1978002013
1979036009
19800280010
1981013015
1982014016
1983002013
1984004004
1985003003
1986122016
198700190019
198800200020
1989110300142
199074590061
1991418160038
1992538110054
199332251100239
199436304602681
199525742201599
199633802801412
199716355000686
199845762402606
199933712400398
200036763202713
200148052900838
200208507400924
20036131640001362
20044143345011483
200565468700639
2006281214101956
20070915113011029
20083835171001009
2009354719800748
2010163235300986
2011247234300817
20125893207001105
2013042930000729
2014443336800805
2015029250054
20160860014
2017010023
Total8015143289402518142