*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197045002047
1970400105
1971300104
1972400004
1973700007
1974200103
1975500106
19768002010
1977700007
1978600006
197910001011
1980500005
198112000012
1982700108
1983800109
198410002012
19857002110
198611005016
198710006016
198810003215
198910005318
199011104622
1991701111029
1992900122344
1993120182748
1994140123121159
199512219100124
1996701899115
19971100161744
19981300491108
19991300111438
2000200019120159
20011200186797
2002121120117151
20031700104269
2004101010129150
20052100201657
20061500152656
2007160027109152
20081520511785
200940135343
2010410641988
2011110078190
2012141044059
201320051053
201400028129
201521018021
2016000303
2017000101
2018200002
Total47710765211812327