*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000505
1971000101
1972000101
1973000101
1974000101
1975000000
1976000202
1977000303
1978000202
1979000617
1980000404
1981000404
1982000909
1983100203
1984000303
1985000426
198600011213
198720010416
1988000516
1989100629
19902007716
1991000292150
199200121159181
199330122611637
19940033221982233
19950003020632093
19960002419561980
199720020610632
19981013412101246
1999100174159
20001044714481500
200110046902949
20020003715971634
20030013810951134
20042003219131947
200510240191234
20061015510211078
20071018714791568
200800079817896
2009000101187288
2010002165400567
2011100180582763
201200197755853
201310102098901110
20140009910111110
2015000431255
201600021719
2017000235
2018000000
Total2202816772320824935