*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100607
1970100001
1971000101
1972000000
1973200002
1974000000
1975100203
1976000202
1977100708
1978100203
1979000639
19800008210
1981100315
1982100416
1983100203
1984000404
1985000303
1986101226
198700019019
198800020020
1989101301042
199000794561
1991004161838
1992005113854
199300311225239
199420346630681
199510222574599
199610328380412
199700150635686
199820424576606
199900324371398
200020332676713
200100429805838
200200074850924
20030064013161362
20041044514331483
200500687546639
2006102141812956
20071001139151029
20080031718351009
2009003198547748
2010001353632986
2011002343472817
20120052078931105
2013000300429729
2014004368433805
2015000252954
20160006814
2017200013
2018000000
Total2508028941514318142