*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970104049
1970000000
1971001001
1972000000
1973111014
1974003014
1975002002
1976001023
1977001023
1978302016
1979005005
1980001012
1981202004
198215370126
198324250031
198424640034
198529850143
1986249180152
19872710170155
19883411230573
19893612320484
199052550264
19911428400100
19921258603106
199323913704173
199433215208195
199529513600170
1996391111000160
1997321312702174
199841107902132
1999414912107218
200039447600159
2001575010003210
2002354915401239
200333376300133
2004716910901250
20055912612602313
2006317911803231
2007112550169
200825830191
200921890294
20100010900109
20111211402119
20126314404157
20137618602201
20144419405207
201512526202281
20166836605385
20178438306401
20183749300503
20197147502485
20205634806365
20216934802365
20227330002312
Total901690591601057612