*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970151007
1970000000
1971001001
1972002002
1973010001
1974022004
1975012003
1976024006
1977006006
1978110002
1979032005
1980021003
1981012003
1982025007
1983032005
1984025007
1985035008
198606120018
198702150017
198808100018
1989015120027
1990030130043
1991226180046
1992223250050
199331003500138
199431724700222
1995111292300163
199651303200167
199771665400227
199861974500248
199941202700151
2000112314400286
200191895100249
200251785800241
200382976400369
2004335910100463
200562779700380
2006527714600428
2007422915800391
2008631319900518
2009820624900463
2010719039500592
2011510140800514
201218777522001317
2013461172810002028
2014651612941002618
20157418531224013152
20169922971524003920
20179925341535004168
20186831401934005142
20198431732025005282
202004410045
202112620029
2022000000
Total67620627128960134200