*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970200103
1970000000
1971000000
1972000000
1973000101
1974000000
1975100001
1976200002
1977200103
1978100102
1979000314
1980000101
1981100203
1982100203
1983100001
1984000000
1985000000
1986000303
1987000303
1988100315
1989300205
19902007110
199120040345
199200025126
199330020124
199470024132
199510018019
199610220124
199740118225
199810011113
199940012218
20001018010
200120312421
200220016119
200320112015
2004200608
2005300407
200640012016
200740012016
200810018019
200900239041
201000028028
201110262166
201230117122
201300015015
2014000101
2015000101
2016000101
2017000000
2018000000
Total6501348222582