*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19905
19914
199214
19935
19945
19956
19968
19975
19985
19992
20003
20017
20021
20039
200411
200514
200620
200711
200820
20092
20102
20110
20120
20130
20140
20150
20160
20170
Total159