*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197010150218
1970000000
1971000011
1972000000
1973000011
1974002002
1975000000
1976000000
1977000000
1978003003
1979001001
1980001001
1981000000
1982000011
1983000000
1984014005
1985111003
1986023027
1987113005
1988011024
19890290213
1990026008
199134100219
199212110014
1993332019
19944290116
19950380213
199621110115
199702210225
199824130120
199922150221
20002190416
200141130119
200224140020
20036450217
200422100418
20050270211
200653100119
20072520211
2008014016
20096370016
201058110024
201154170228
2012013015
201301120417
2014143019
201532100015
20162170010
20174060010
Total6980299048496