*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970205007
1970002002
1971000000
1972001001
1973000000
1974000000
1975001001
1976003003
1977006006
1978002002
1979205007
19808030011
1981110120023
1982174130034
198324410029
1984422008
1985102003
19861180010
19871290012
198840210025
198933150021
199076180031
199173250035
199217180026
199336330042
1994552320089
1995614410061
1996520210046
19977257701110
1998525610091
199956260037
200010406200112
2001132560071
200241780184
200373870097
200424800086
200582820092
2006164590079
20071059000105
2008329600101
20095149700116
201016010700123
20117312400134
201244690077
201361390046
201402120014
201542340040
2016002002
2017002002
Total2442691639022154