*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197092002094
1970300003
1971800008
1972500005
1973600006
1974500207
1975701109
1976800109
1977800008
1978800008
19798002010
19809000110
198112000012
198211001012
198310002012
198413001014
198513002015
198615011017
198717004021
198816011321
198916002220
199015054226
1991141718444
1992110616942
19932001020656
19942104122461
1995200581548
1996110661942
199721010111355
19981604131649
1999170414641
200024045232112
2001230324656
2002230346779
20032201251462
2004200391749
20052501161456
20062501251263
2007256238980
2008174345271
200960337147
201050059670
2011160059075
2012190128250
201301332238
201400421328
2015211468893
201610310014
2017120317
2018000000
Total719181117312561835