*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970401308
1970000000
1971000000
1972000101
1973100001
1974100102
1975200103
1976200204
197720011013
1978000303
1979101709
1980100506
1981000718
198220014016
1983000404
1984200103
19852005714
19861006714
198700010313
19883013714
198920210620
1990003181738
19911016211452
1992201131127
1993005311450
1994001262653
1995002321145
1996007232959
1997102472878
1998103402367
199920130841
200000336746
200110237646
200200157361
200310567578
2004104771193
20050031055113
2006009915105
20070031026111
20082051075119
20090021912195
20100081553166
201100102109229
2012000958103
201300366271
201400031637
201500025227
2016000000
2017000000
2018000000
Total38010418272972266