*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
20100011000110
20111211502120
20126314704160
20137718602202
20144419505208
201512526702286
20166837605395
20178438907408
20183749900509
20198148702498
202010535807380
20216936802385
202212330602323
202312260029
Total913692602301077735