Improve the grammaticality of this text: Countries like Singapore and Japan have a social security system in place to help the aged, and at the same time, a substantial sum of public spending is put into their health and welfare.
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The following is a list of the countries with the highest and lowest GDP per capita in the world, in terms of GDP per capita.
|Country||GDP per capita|
|United States||US$ 1,210|
|United Kingdom||US$ 1,200|
|United Kingdom||US$ 1,100|
|United States||US$ 1,000|
|United Kingdom||US$ 1