*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970001001
1971000000
1972000000
1973002002
1974000000
1975001001
1976000000
1977000000
1978000000
1979003003
1980000000
1981000000
1982002002
1983000000
1984003003
1985001001
1986021003
1987017008
19880580013
19890280010
199011980028
199121560023
1992128160045
199315550061
199421642000186
199515380062
19960961200108
19971101400106
199811011200114
199905750062
200001552100176
20010156800164
200202332200255
200302531800271
200412071000218
200511471400162
200621613100194
200701784000218
200811103900150
20090425800100
2010030010000400
20111399600136
20122782400104
201311223400157
20140891700106
201503170020
2016030003
2017000000
Total192975683003677