*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19760
19770
19783
19791
19801
19810
19820
19830
19840
19851
19860
19870
19883
19892
199013
199142
199230
199319
19949
199511
199610
199717
199810
19996
20003
200111
20026
2003109
200486
2005108
200695
200783
200893
2009107
201094
201198
2012158
2013123
2014107
2015117
2016108
201795
20181
Total1781