*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197011100012
1970050005
197101300013
1972040004
1973030003
1974010001
1975020002
1976001001
19770820010
1978041580099
197903010031
198003000030
198102110022
198201700017
1983070007
1984070007
1985020002
19860930012
1987050005
198801800018
198901810019
199002610027
199103020032
199203520037
199304610047
199404950054
199515140056
1996128100039
1997265200087
199813640041
199911150017
200005640060
200108130084
200201151500130
200331053400142
200402743200306
200511282700156
200601091100120
20070280700287
20082147800157
20091981100110
201001411500156
201104202000440
201204712500496
20130117600123
201408800088
2015053008
2016006006
2017000000
Total143254358003626