1998	12.94	20.30	0.64	1998	7.96	19.55	0.41
1999	13.01	20.18	0.64	1999	8.10	19.96	0.41
2000	12.34	19.49	0.63	2000	8.65	19.64	0.44
2001	12.73	19.98	0.64	2001	9.28	19.85	0.47
2002	13.77	19.92	0.69	2002	9.67	19.71	0.49
2003	14.75	19.78	0.75	2003	9.91	19.83	0.50
2004	14.82	19.85	0.75	2004	10.95	20.78	0.53
2005	15.38	19.89	0.77	2005	10.20	19.45	0.52
2006	14.95	19.72	0.76	2006	10.69	18.47	0.58
2007	14.23	19.89	0.72	2007	11.36	19.89	0.57
2008	13.27	19.42	0.68	2008	11.63	19.62	0.59
2009	12.99	20.64	0.63	2009	13.46	19.36	0.70
2010	12.89	19.44	0.66	2010	12.41	19.58	0.63
2011	11.87	20.13	0.59	2011	21.13	20.07	1.05
2012	11.94	19.21	0.62	2012	19.48	20.46	0.95
2013	12.29	19.47	0.63	2013	19.40	19.90	0.97
2014	12.52	20.00	0.63	2014	20.19	19.80	1.02
2015	14.04	19.67	0.71	2015	23.09	19.83	1.16
2016	14.90	19.81	0.75	2016	18.04	19.93	0.91
2017	14.46	19.72	0.73	2017	18.90	19.63	0.96
Ave.	12.76	19.84	0.64	Ave.	11.87	19.74	0.60