*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197020100214
1970001001
1971002013
1972000011
1973002002
1974062008
1975023027
1976002013
197703130117
19780380011
197922120016
1980006017
1981015017
198200130215
19831080110
1984003025
19851360010
198615150021
198716120221
198823150121
1989610120129
1990211290244
1991715390061
199207350143
19931311580183
19941221480081
199597490368
1996923420276
1997423610391
1998316540376
1999211500568
200028440256
200126590370
200213810287
20031059803116
20049208902120
20058613703154
20062712000129
20071511314124
20080213401137
20094321400221
20102426404274
201110937005394
201236464012485
20131950108519
201467427016456
20157550907528
201686608013635
201718689508927
2018111011060111138
20191991063051096
20208710900131118
20213697509993
20223495508970
202300100010
202400210122
Total21534210962117911699