*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000033
1970000000
1971000000
1972000000
1973000000
1974070007
1975060017
1976031015
1977043018
1978041005
1979043018
1980003014
1981003058
1982002013
1983022015
1984001034
1985030014
19860380112
19870370313
19880640212
19890581418
199001350422
199104260333
199205190226
199313250332
199418360752
199516251538
199621180425
199707180631
199817280743
1999171601236
200006310946
200102240632
200200260531
200303270535
200413120723
200507280540
200604401752
2007122501038
200811540460
200911780686
20101218805196
20110220806216
2012110158022191
20131412822137
201400150217
201500100010
2016006006
2017001001
Total14158132151831681