*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197040000141
1970000000
1971100001
1972300003
1973400105
1974300205
1975500005
1976500005
1977600006
1978500005
1979700007
1980500117
1981800109
19828002010
1983700108
1984800109
19858003011
19869005115
1987110013125
1988130017030
19898005215
199080161126
19917017419
1992100245773
1993100058196
1994150317747782
1995161214771804
19966007671684
199713008219240
199811006443460
1999110054056
2000160017604637
2001150019174208
2002130015348376
200360011113130
200411007386404
2005140013121148
200619009206234
200790216284311
20086002891125
200980037045
20102003568105
2011200444995
20122009173184
2013000474693
2014000286088
201500011011
2016000257
2017000000
2018000000
Total39411147957786663