*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19752
19762
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
198716
198824
198911
199018
19913
19921
19937
19942
19951
199610
19971
199815
19994
200026
200122
200221
200362
200463
2005185
2006102
200776
200849
2009118
201082
2011193
2012162
201325
20148
20150
20160
20170
Total1313