*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971000000
1972000011
1973001012
1974000000
1975000000
1976000000
1977000000
1978000000
1979001001
1980001001
1981011002
1982001001
1983000000
1984002002
19851540010
19861750013
19872390014
19882180011
1989126009
199012160028
1991410190033
199243200128
199338250036
1994217290048
199537330043
1996512160134
1997110250137
1998114180033
199905140019
200014190024
200125290036
200204310035
200306370043
200407340041
200528460056
200606630069
200711560058
200804530057
200903810084
20101517100177
20111314500149
201202012000140
201302840086
201400110011
201500120012
2016003003
2017001001
Total392041242051490