*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970001001
1971000000
1972000000
1973001001
1974000000
1975000000
1976002002
1977001001
1978001001
1979000000
1980001001
1981000000
1982002002
1983001001
1984001001
1985013004
1986001001
1987015006
1988017008
1989036009
1990225009
199143100017
199272170026
199315270033
1994017490066
199535530061
199626690077
1997013150028
1998012320044
199904130017
200004570061
200113240028
200226370045
200307310038
200401913600155
2005012350047
2006610440060
2007023380061
200808300038
200902300032
20101258900115
201109400049
201201610017
201301200021
201410130014
20150390012
2016014005
2017112004
Total31225963001219