*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19863
19879
19887
19892
199012
19911
19924
19937
19949
19957
19961
19974
19982
19991
20006
20015
20022
20033
20040
20051
20064
20070
20080
20093
20100
20110
20120
20130
20141
20150
20160
20170
20181
20193
20200
Total99