*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19703040138145
1970001045
197100001010
1972001078
1973000088
19740710715
19750740920
197604301320
1977161401637
197805901327
1979342201645
1980011801837
1981112401945
1982302502351
1983041002034
1984101302236
198526701934
1986531702146
1987682322867
1988451602550
19898152212470
199014253112394
1991372576220160
19921411103021149
19932426178132261
19942662145037270
19952723105128184
1996255782025189
19971862170137288
19981367135030245
199943794125161
20002036127037220
20011213176036237
200229233018262
20031610240129296
2004825210032275
20051914282036351
20061518355030418
20071514267535336
20089123941132458
20092212621034689
20102621744039830
201192210140491094
2012133884061171014
20131270568112663
201432717511207
20152511008125
201642270134
2017001001
Total446819773735128410321