*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700040102106
1970000033
197100001010
1972000077
1973000066
1974001056
1975001089
197600201214
197700101213
197800101011
197900401519
198000101415
198100202022
198200401923
198300101617
198400101920
198500202123
198600402226
198700902534
198800302124
198900202022
199000311822
1991002031942
1992001102233
199300802432
1994001412742
1995001712341
1996003001949
1997001512339
1998002502550
199900902029
2000001102738
2001001503247
2002002901746
2003001901736
2004001302639
2005001202537
2006002512753
2007001522946
2008003032457
2009001602844
2010002403054
20110057050107
20120064057121
201300106235143
201400122069191
2015001630117280
2016001500125275
2017002141153368
2018003041120425
2019003626151519
2020004691143613
2021003601189550
2022001712139312
2023002002
2024001034
Total0029492722405216