As per the 2010 Zambian census, Copperbelt Province had a population of 1,972,317 accounting to 15.21% of the total Zambian population of 1,3,092,666. There were 981,887 males and 990,430 females, making the sex ratio to 1,009 for every 1,000 males, compared to the national average of 1,028. The literacy rate stood at 83.10% against a national average of 70.2%. The rural population constituted 19.11%, while the urban population was 80.89%. The total area of the province was 31,328 km2 and the population density was 63.00 per km2. The population density during 2000 Zambian census stood at 63.00. The decadal population growth of the province was 2.20%. The median age in the province at the time of marriage was 21.7. The average household size was 5.3, with the families headed by females being 4.8 and 5.5 for families headed by men. The total eligible voters in the province was 66.10%. The unemployment rate of the province was 22.10%. The total fertility rate was 5.0, complete birth rate was 5.8, crude birth rate was 29.0, child women population at birth was 587, general fertility rate was 112, gross reproduction rate was 1.8 and net reproduction rate was 1.7. The total labour force constituted 50.40% of the total population. Out of the labour force,63.2% were men and 37.7% women. The annual growth rate of labour force was 2.7%. Bemba language was the most spoken language with 83.90% speaking it. Albinism is a condition where the victims do not have any pigment in their skin, hair or eyes. The total population in the province with the condition stood at 2,912. The life expectancy at birth stood at 54 compared to the national average of 51.

Answer this question based on the article: How many percent higher was Copperbelt Province's literacy rate as compared to the national average?
12.9