YEAR	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual 24-hr Avg.
1990	3211	3441	3673	3784	3744	3800	3745	4177	3852	3518	3355	3171	3623
1991	3107	3394	3617	3719	3803	3823	3886	4289	3923	3703	3501	3610	3700
1992	3385	3593	3869	3990	3997	3927	3938	4322	4100	3795	3509	3590	3846
1993	3255	3458	3810	4067	4052	4022	3926	4361	4208	3876	3661	3729	3871
1994	3539	3673	4057	4401	4141	4208	4134	4251	4258	3921	3602	3719	3993
1995	3467	3685	3815	4037	4147	4064	4222	4277	4258	4041	3854	3944	3984
1996	3474	3833	4056	4129	4044	3896	3969	4460	4216	3926	3843	3773	3968
1997	3646	3832	3951	4169	4328	4526	4139	4496	4165	3886	3734	3838	4059
1998	3547	3752	3963	4147	4147	4131	4176	4501	4313	4128	3940	4036	4065
1999	3779	4021	4316	4490	4693	4824	4648	4616	4359	4284	4093	4249	4364
2000	3784	4036	4185	4207	4316	4442	4032		4594	4226	3776	4248
2001	3863	4065	4195	4346	4365	4347	4285	4667	4394	4205	4516	4225	4289
2002	4110	3996	4369	4724	4531	4687	4496	4734	4545	4522	4121	4233	4422
2003	3964	4098	4195	4471	4543	4612	4409	4724	4427	4322	4071	4099	4328
2004	3836	4061	4237	4401	4367	4378	4621	4722	4419	4311	4155	4389	4325
2005	4046	4206	4293	4433	4560	4615	4713	4802	4493	4237	4229	4352	4415
2006	4076	4260	4307	4496	4569	4590	3708	3670	3716	4005	4131	4161	4141
2007	3925	4140	4270	4358	4480	4214	4201	4491	4130	4073	3958	4127	4197
2008	3863	4045	4095	4305	4414	4288	4353	4553		4237	3984	4210
2009	3944	4077	4149	4501	4688	4454	4633	4792	4548

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