*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971001001
1972000000
1973000000
1974001001
1975000000
1976000000
1977002002
1978003003
1979005005
1980002002
1981003003
1982002002
1983001001
1984002002
1985103004
1986005005
1987006006
1988005005
1989008008
1990135009
19912450011
19920480012
19930290011
1994110100021
199544190027
19962180011
19971460011
19981560012
1999016007
200011220024
200111150017
200200310031
2003111290041
200402240026
20051550011
200601450046
200704260030
200800240024
200926320040
201019320042
201106330039
201212070028
201315250031
20140570012
201518120021
2016002002
2017000000
Total2312250400649