现在的信用卡都提供年度花费统计。很方便。
在统计自家的2013年代花销，看到这。
http://www.bls.gov/news.release/cesan.nr0.htm “CONSUMER EXPENDITURES--2012“。

                                                  2010         2011         2012  
-------------------------------------------------------------------------------
Average annual expenditures:
Total                                          $48,109   $49,705     $51,442   
Food                                             6,129       6,458          6,599  
     At home                                   3,624       3,838          3,921 
     Away from home                      2,505       2,620          2,678 
Housing                                      16,557      16,803       16,887 
Apparel and services                    1,700       1,740          1,736 
Transportation                              7,677       8,293          8,998
Health care                                   3,157       3,313          3,556 
Entertainment                               2,504       2,572          2,605
Cash contributions                        1,633       1,721          1,913
Personal insurance                       5,373       5,424          5,591
pensions All other expenditures    3,379       3,382          3,557

平均家庭的开支也就是$51,000。那还包括了保险等。我感觉WXC的大部分人都远远超出这了。