*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197037001038
1970100001
1971400004
1972200002
1973100001
1974000000
1975200002
1976200103
1977400004
1978400004
1979400206
1980400105
1981400004
1982300003
198316001017
1984600006
1985900009
1986100607
19877004011
1988200204
19897003010
1990200406
199140014018
19922008010
19936005011
19947008015
19956008014
199610008018
1997130012025
1998400509
1999300508
200012008020
20017009016
200230012015
200310011012
200414004018
200512003015
20067008015
2007400408
2008101010021
20095006011
20106004010
201191031041
2012100203
2013100304
2014000000
2015000000
2016100001
2017000000
2018000000
Total270202130485