*Excludes Observations that spanned multiple years

Pre 19700
19702
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19831
19840
19850
198626
19872
19885
198913
19909
19912
19925
199316
19942
19957
199615
199739
199814
19994
200018
20011
20026
20033
20043
20057
20060
20072
20081
20091
20100
20110
20120
20131
20140
20150
20160
20170
Total206