YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1990	3117	3298	3397	3539	3471	3482	3393	3447	3171	3444	2410	2857	3253
1991	2902	3187	3215	3426	3357	3369	3399	3417	3144	3424	3204	3299	3279
1992	3244	3380	3507	3592	3480	3742	3607	3694	4066	3300	3135	3248	3508
1993	3043	3141	3508	3589	3475	3704	3450	3442	3365	3396	3358	3340	3402
1994	3296	3488	3657						3420	3454	3415	3397
1995
1996										4240	4074	3971
1997	3964	4276	4293	4507	4363	4413	4172	4169	4101	4200	4023	3988	4206
1998	3886	3933	4133	4270	4219	4324	4428	4460	4234	4496	4215	4219	4235
1999	3992	4125	4280	4197	4311	4444	4202	4095	4179	4271	4063	4100	4188
2000	4048	4237	4347	4320	4292	4113	3750	3906	3953	4079	3939	4049	4086
2001	3962	4180	4393	4339	4338	4263	4037	4155	4073	4191	4120	3861	4159
2002	4008	4214	4214	4440	4994	4205	4180	4130	4099	4298	4065	4072	4243
2003	4064	4149	4003	4340	4289	4245	4052	4332	3628	4177	3762	3910	4079
2004	3766	3854	4221	4430	4140	4212	4076	3998	3986	4005	3963	4032	4057
2005	3816	4166	4253	4338	4247	4207	3898	4094	4121	4114	3937	3888	4090
2006	3883	4150	4368	4307	4317	4217	3871	4012	3979	4022	3871	3659	4055
2007	3754	3964	4032	4141	4115	4049	3795	4035	3762	4066	3794	3554	3922
2008	3706	3877	3855	4165	4035	3972	3870	3727	3850	3859	3590	3607	3843
2009	3615	3856	3791	4054	3886	3902	3776	3698	3684

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