Yes they did: https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&ctype=l&strail=false&bcs=d&nselm=h&met_y=ny_gdp_pcap_kd&scale_y=lin&ind_y=false&rdim=r

Yes they did: https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&ctype=l&strail=false&bcs=d&nselm=h&met_y=ny_gdp_pcap_kd&scale_y=lin&ind_y=false&rdim=region&idim=country:JPN:USA&ifdim=region&hl=en&dl=en&ind=false#!ctype=l&strail=false&bcs=d&nselm=h&met_y=ny_gdp_pcap_cd&scale_y=lin&ind_y=false&rdim=region&idim=country:JPN:USA&ifdim=region&hl=en_US&dl=en&ind=false https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&... But it doesn't really matter whether Japan got to 105% or 95% of US GDP in 1990 - my point that China could get to 30-50% of US GDP in 30 years stands.