*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19704363106122
1970001045
1971000099
1972000077
1973000055
1974001067
1975002057
197600201113
197700501217
197800301114
197900601521
1980012001334
198100901827
198200901524
1983001501732
198400501621
198501201316
198601701725
198705701830
1988041041836
1989051012036
1990128631553
19916151311651
1992231801437
19933101411947
19942432902397
19954123511971
19967303701690
1997428299124356
1998135222025283
1999134200020255
2000127317032377
200157351023386
200232355015375
2003813442019482
20042142433018595
2005292298019411
2006418450025497
2007030379326438
20082612371022332
20096179149040374
20100162148033343
2011241220039302
20120137238165441
2013163142220228
201402684017127
20152122402361
2016015402580
2017054023077
201800431623
201902303430
2020032005
2021000000
Total73130253603910587832