*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970010001
1970000000
1971000000
1972000000
1973000000
1974000000
1975001001
1976100001
1977000000
1978001001
1979000000
1980001001
1981001001
1982000000
1983000000
1984000000
1985000000
1986001001
1987011002
1988143008
1989131005
1990150006
1991030003
1992050005
1993021003
199421330018
199502020022
199621250019
199703220034
199852810034
199901120013
200011940024
200101920021
200213060037
200303970046
200403140035
200502130024
2006150100061
200704280050
20081840013
2009020120032
2010015110026
2011029220051
201205650061
201303990048
2014036120048
201501120013
2016062008
2017006006
Total1760116500783