*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197016006022
1970000000
1971000000
1972000000
1973000000
1974000000
1975100001
1976000000
1977000000
1978100001
1979100001
1980100102
1981200204
1982000000
1983000000
1984000101
1985100001
1986000112
1987100102
1988200204
1989000707
1990100405
19910028111
199200316019
199310317122
199410522331
199540626137
199610621129
199710012215
199800120021
199910213117
20002017010
2001001341247
200200768479
200310414423
200430135544
2005413010449
200610110113
2007202151837
20080009110
2009000404
201000016016
2011000808
2012100359
20130014611
20140002911
20150004812
2016000202
2017000000
2018000000
Total5017642588640