*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700050813
1970001001
1971002002
1972003014
1973002013
1974052007
1975022037
1976013059
19770380314
19780260311
197910120215
19801050612
19810190616
198211120620
19830090211
1984004048
19851390518
19860340310
198722160424
198826130728
1989511110633
1990216190643
1991318270856
199209180633
1993119550984
1994103056012108
19957175401290
19961230470897
199752680010121
199823285011130
199911774012104
20004146401597
20013976012100
20022411409129
200376111010134
2004113104015133
2005118153014186
2006126162012192
200757118017147
20083617517192
200953258018284
201034317016340
201148386024422
201276660038711
20134610330401083
201410910860851190
201510714700701557
2016136185831011981
2017191522291862350
201821822070792315
2019231823410742456
20200039177117
2021003003
2022000000
Total23340715617698817251