*Excludes Observations that spanned multiple years

Pre 197057
19700
19711
19720
19731
19742
19752
19762
19771
19781
19792
19802
19810
19824
19832
19840
198511
198646
19875
198817
198924
199012
19917
19928
199325
199416
199546
19968
199729
199844
199922
20009
200123
200224
20034717
20041165
20051456
2006486
2007590
2008250
20092031
201014
201111
201217
201328
201479
201584
2016235
2017484
20181
Total12101