*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970006211542
1970000101
1971000000
1972000101
1973000000
1974000808
1975000101
1976000000
1977000000
1978000213
197900619429
1980003216
1981003016652
198200238536
19830012172150
19840011171038
19850065920
198600910827
19870019151549
19880035232583
198900591125
1990002103
19910025101247
199200573141129
1993007102037
19940023402992
199500891113113
1996001282881237
19970015950133342
19980024887146481
1999002143044288
2000001803140251
200100721216100
200200852534144
2003002021135248
20040012863137
2005001421213167
20060012877142
20070010747118
2008009428104
200900651425
20100026231968
2011001544362
2012001922041
2013007108
2014001315
20150097925
2016000303
2017000000
2018000000
Total0023386918593888