*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
2009117801494
201012188012203
201102210014226
2012110160032203
201315129211148
201403160827
201500110718
20160080513
201716201019
2018003014
2019012003
2020000000
Total15169133652541779