*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000009393
1970000044
197100001010
1972000044
1973000077
1974001056
1975000088
197600101213
197700201315
197800001212
197900001515
198000101617
198100101718
198200102122
198300201719
198400102324
198500202022
198600502126
198700612128
198800402428
198900502126
199000302124
1991004002060
1992002302447
1993002313357
1994001423248
1995002613562
1996002602652
1997001823353
1998003503570
1999013502561
2000002903968
2001001303043
2002001701835
2003001201931
200400602026
2005002502752
2006002212851
2007001333854
2008002173260
2009001902039
2010002501944
2011004911666
2012002403862
201300220426
2014008109
2015021069
201600201012
2017000044
Total035832010361642