But for some dealers, more than half of turnover comes from leasing.
Around half of their shareholders and much more of their turnover comes from outside the country.
By 1979 about a quarter of Longman's turnover came from ELT.
In 2015, more than 40% of Cosprop's turnover came from overseas sales.
Around half of GEPS's turnover comes from things that it did not even sell in 1995.
More than 80% of the industry's turnover comes from lower-spending, but more numerous, domestic tourists.
About 70% of its £7m turnover comes from exports, with China and the US its biggest markets.
Now we're a global culture, so haggis has come full circle, and now more of our turnover comes from England than Scotland.
But although less than half of the combined group's turnover comes from its home countries, Alcatel-Lucent failed to transcend its national origins.
"We've gone from less than 1% of our total turnover coming from the internet and mobiles to this year being nearly 6% of revenues".
Britain's commercial aerospace sector is an even bigger exporter than defence: 90% of the sector's £28bn turnover comes from exports.
