*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970100001
1971100001
1972200103
1973200204
1974100102
1975300104
1976300003
1977200305
1978200305
1979200204
19802009213
1981500207
1982400206
1983200406
19844008012
19853068017
198640020125
198750214223
19881101143065
1989100958279
1990932728370
199150928345
1992501021339
1993111411229
1994901201141
199591721341
199680028541
1997110115229
199880112627
1999110116230
2000160312031
2001130123239
2002100131042
2003150538765
2004140033047
2005180232052
20061801064698
200716048812120
20081905907121
20091001010111132
20107077614104
201192479498
2012123152371
201329007019118
2014003291345
201531121531
2016100708
2017000213
2018000000
Total3651114612291511902