*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197010302428
1970013037
1971001045
1972002057
1973001045
1974001034
1975003047
1976102069
19771060512
197800150621
197990150630
198018350531
198122210934
1982711301031
198316290936
198413840530
1985012036
1986121801233
1987061721641
1988242301241
1989182901553
1990283734013112
1991163045012103
19927881012108
19931218165021216
19941557268018358
19951019191023243
1996935192018254
19971239154022227
1998961191018279
199983193021153
2000640217027290
20012015223023281
2002116250018285
20032716273019335
20042310265016314
20051511202023251
20062818271028345
200721212871234375
200830463561028470
20092123463027534
20103622476020554
20112718600130676
20122612252070360
20131319416037485
2014178714310248
2015104217505205
20166834216120
2017266120044
2018611019
Total7237686431277568705