They sold approximately 4000 in each of the three years prior to 2018, in the USA. I didn't say they sold 1400 through 2018, I said 1400 in 2018. These numbers come from InsideEVs.
Last year they sold about 7200 to Norway alone[1]. They apparently had low production capacity but is ramping up and expects to sell over 10k in Norway this year.
[1]: https://www.tek.no/artikler/i-fjor-hadde-vw-ett-ars-levering...