pre_text: The Systems gross profit margin increased 3.2 points to 53.1 percent in 2019 compared to the prior year. The increase was driven by actions taken in 2018 to better position the cost structure over the longer term, a mix to IBM Z hardware and operating systems and margin improvement in Storage Systems. Pre-tax income of $701 million declined 22.4 percent and pre-tax margin of 8.4 percent decreased 1.8 points year to year driven by the declines in Power Systems and Storage Systems revenue and the continued investment in innovation across the Systems portfolio, mitigated by the benefit from the new hardware launches in the second-half 2019.
table: ($ in millions)
table: For the year ended December 31: 2019 2018 Yr.-to-Yr Percent/ Margin Change
table: Systems
table: External Systems Hardware gross profit $2,622 $2,590 1.2%
table: External Systems Hardware gross profit margin 44.3% 40.7% 3.6pts.
table: External Operating Systems Software gross profit $1,412 $1,412 0.0%
table: External Operating Systems Software gross profit margin 83.8% 84.5% (0.7)pts.
table: External total gross profit $4,034 $4,002 0.8%
table: External total gross profit margin 53.1% 49.8% 3.2pts.
table: Pre-tax income $701 $904 (22.4)%
table: Pre-tax margin 8.4% 10.2% (1.8)pts.
question: Analyse this data from a financial earnings document. What was the average External Systems Hardware gross profit?