*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197001205962
1970001012
1971000044
1972000044
1973000077
1974000055
1975001078
19760020911
1977000099
1978000066
197900201012
198000001010
198100001313
19820020810
1983001078
198401201013
198500001111
198601401116
198700301013
198801201215
198901001213
199001101416
199104120723
19921360919
1993017401738
1994039501761
1995173122896
1996163401078
1997130301347
199801004012116
199905301725
2000011012017139
20011511101982
2002012817015160
20030977018122
2004012812018158
20050211212054
20060471312182
2007318221015221
20080311311257
200907170630
2010021340459
2011015400863
20120391301466
2013037120150
201403160037
2015007007
2016006006
2017000000
Total8128532955372164