| 年份 | 分类 | 数值 |
| 2007 | United States : number of customers | 1,720,748,000.00 |
| 2008 | United States : number of customers | 1,722,350,000.00 |
| 2009 | United States : number of customers | 1,729,678,000.00 |
| 2010 | United States : number of customers | 1,734,108,000.00 |
| 2011 | United States : number of customers | 1,743,523,000.00 |
| 2012 | United States : number of customers | 1,755,459,000.00 |
| 2013 | United States : number of customers | 1,768,480,000.00 |
| 2014 | United States : number of customers | 1,783,594,000.00 |
| 2015 | United States : number of customers | 1,800,533,000.00 |