'Staggering' New Data Shows Income Of Top 1% Has Grown 100 Times Faster Than Bottom 50% Since 1970

I found a time series regarding common dreams varying income classes share of GDP and visualized it, in an, I feel, more illustrative way than the original visualization. I'd appreciate your feedback on making my visualization clearer.

income  <- read.csv('/tmp/income.csv', header=TRUE, row.names=NULL)
colnames(income)  <- c('Year', '0-50pct', '50-90pct', '90-99pct', '99-99.9pct', '99.9-99.99pct', '99.99-100pct')
ggplot(income, aes(x=Year)) + geom_line(aes(y=income[,2]), colblue')