*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970011002
1970000000
1971000000
1972000000
1973000000
1974000000
1975001001
1976000000
1977002002
1978000000
1979000000
1980001001
1981002002
1982000000
1983000000
1984000000
1985000000
1986031004
1987002002
1988021003
19890650011
199001220014
19918750020
19920740011
199301480022
1994133110045
199501390022
199601850023
199714930053
199814410046
199913080039
200003780045
200103680044
2002039110050
2003551100066
20040822300105
2005050150065
20061832300107
200705390062
2008021270048
2009225280055
2010025290054
20110654700112
20120795300132
2013043160059
201404330046
20150860014
201602120014
2017003003
Total20981403001404