*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000005959
1970000011
1971000055
1972001045
1973000044
1974021058
1975011068
197603201116
197721201116
19780230813
197900201214
19800030912
198100601622
198201801726
198300201618
198400401620
198501501521
1986141011733
1987141001631
1988031501836
198905602031
1990391501946
1991315101016135
19923135901792
1993814147020189
199461592122136
199581266017103
19963116201692
19977106002299
199841679019118
1999772901861
200041480026124
2001535602488
2002217601493
200342100019125
2004325002075
2005325502888
20065487021117
20075482124116
200840110316133
200910109029139
201072155026190
201110156030187
20122182046131
201342375020122
2014444401971
2015402102449
201600801725
201726502235
20185220211
201933110118
2020102003
2021102003
Total126222215969003413