Hello; I did not find the graphs of population demographics but did find soem demographic information for the USA and China. Seems as of 2014 the USA population is increasing at a faster rate than China.
http://www.indexmundi.com/united_states/demographics_profile.html
USA birth rate 2014 at 13.42 per 1000 population
USA death rate 2014 at 8.15 per 1000 population
yields 5.27 increase per 1000 population from births
net migration rate 2014 at 2.45 migrants per 1000 population
with migration and births the USA has an increase rate of 7.72 per 1000 population
USA population seems to be increasing faster than China
http://www.indexmundi.com/china/demographics_profile.html
China – birth rate 2014 at 12.17 per 1000 population
death rate 2014 at 7.14 per 1000 population
yields an estimated net increase of 5.03 per 1000 population. China does have a very small out flow from migration.
http://www.indexmundi.com/united_states/demographics_profile.html
USA birth rate 2014 at 13.42 per 1000 population
USA death rate 2014 at 8.15 per 1000 population
yields 5.27 increase per 1000 population from births
net migration rate 2014 at 2.45 migrants per 1000 population
with migration and births the USA has an increase rate of 7.72 per 1000 population
USA population seems to be increasing faster than China
http://www.indexmundi.com/china/demographics_profile.html
China – birth rate 2014 at 12.17 per 1000 population
death rate 2014 at 7.14 per 1000 population
yields an estimated net increase of 5.03 per 1000 population. China does have a very small out flow from migration.