*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19707060922
1970000011
1971001023
1972002013
1973001012
1974001012
1975001023
1976002013
1977001012
1978002002
1979003003
1980001023
1981005005
1982011002
1983002002
1984101013
1985103015
1986303017
198710100011
1988206019
1989102003
199001170018
199110180221
199220200426
199320190627
1994130260342
1995151380761
199660440151
1997170370256
1998210220245
1999251270255
2000262230556
2001380280268
2002384310174
2003400180159
2004532280184
2005511110467
2006624290297
200711181223
200801220326
200953340042
201021440148
2011411610076
201210111900121
201353322300108
20146430600100
201518950032
20165980123
2017001001
Total6791257211771603