*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970015006
1970002002
1971001001
1972001001
1973001001
1974001001
1975000000
1976001001
1977001001
1978002002
1979001001
1980001001
1981001001
1982003003
1983001001
1984003003
1985001001
1986011002
1987004004
1988117009
1989045009
1990161019
199101220014
199211440019
199305270059
199413841000395
19952305400311
19960357300360
199703050035
19980226100227
199902640030
20000338700345
20010174301178
20020443900452
200301521400166
20040472600478
20050871102100
200604531301467
20070445800453
2008071120083
20091654100107
201001913900230
201101833901223
20120212701220
201311729200265
201401953000225
201503100013
2016032005
2017000000
Total85078427075520