Problem to plot GDP data coming from Wolfram Alpha

I'm working with economic data and realized that I could extract it directly from WolframAlpha using _Mathematica.So I did it. I extracted the GDP data of the country I'm studying.

nominal =   WolframAlpha["nominal gdp of brazil", {{"History:GDP:WorldDevelopmentData", 1}, "TimeSeriesData"},    PodStates -> {"History:GDP:WorldDevelopmentData__Linear scale"}];

So until now I'm ok. The trouble begins when I try to plot it using DateListPlot[nominal] because I just get an empty frame? I noticed that the GDP comes in US dollars and maybe some additional parameters are needed. I looked for it in the doc but couldn't find the solution. Thank's for the help.

Here goes a sample of what I got

{{{1960, 1, 1, 0, 0, 0.}, Quantity[1.51656*10^10, ("USDollars")/("Years")]},   {{1961, 1, 1, 0, 0, 0.}, Quantity[1.52369*10^10, ("USDollars")/("Years")]},   {{1962, 1, 1, 0, 0, 0.}, Quantity[1.99263*10^10, ("USDollars")/("Years")]},   {{1963, 1, 1, 0, 0, 0.}, Quantity[2.30215*10^10, ("USDollars")/("Years")]},   {{1964, 1, 1, 0, 0, 0.}, Quantity[2.12119*10^10, ("USDollars")/("Years")]},   {{1965, 1, 1, 0, 0, 0.}, Quantity[2.179*10^10, ("USDollars")/("Years")]},   {{1966, 1, 1, 0, 0, 0.}, Quantity[2.70627*10^10, ("USDollars")/("Years")]},   {{1967, 1, 1, 0, 0, 0.}, Quantity[3.05918*10^10, ("USDollars")/("Years")]},   {{1968, 1, 1, 0, 0, 0.}, Quantity[3.38759*10^10, ("USDollars")/("Years")]},   {{1969, 1, 1, 0, 0, 0.}, Quantity[3.74589*10^10, ("USDollars")/("Years")]}.........