*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000055
1970000000
1971001034
1972000011
1973000022
1974002024
1975000033
1976000044
1977001034
1978000011
19790080412
1980001023
1981002057
1982003069
1983002002
19840050510
1985002035
19860080614
198700150419
198800100818
19890080614
199000350540
199100380341
199200480452
199300520961
1994004901362
199500510556
199600480149
199700600565
199800350843
199900330942
2000003301144
200100370744
200200520557
200300350540
200400450752
200500230831
200600280533
200700250631
200800401445
200900650873
201000520658
201100740882
201200105113119
201300233018251
201400211027238
201500299026325
201600361060421
201700359015374
201800547015562
201900368025393
2020001302740
2021002013
2022002002
Total00352624423970