*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700200810
1970000022
1971000033
1972000011
1973000022
1974000033
1975000011
1976000011
1977000033
1978000000
1979000011
1980000000
1981000022
1982001012
1983000000
1984000000
1985002024
1986000000
1987001001
1988001001
1989023016
1990041005
1991004004
19920470213
199302340330
19940148801157
19950157402163
19960132402138
199703960247
19980168103172
199901410015
20000200701208
200106650071
20020129500134
200303750143
20040149401154
200504750153
200602220024
2007027110038
200802450029
200900120012
201007180025
201105210026
201204300043
201303100031
201404710048
2015002002
2016040004
2017000000
Total015311510501732