Table:
|  |  | Net additions (losses) |  | % of penetration(2)(3) |  |
| --- | --- | --- | --- | --- | --- |
|  | August 31, 2019 | August 31, 2019 | August 31, 2018 (1) | August 31, 2019 | August 31, 2018 (3) |
| Primary service units | 901,446 | 16,981 | 20,251 |  |  |
| Internet service customers | 446,137 | 21,189 | 21,417 | 50.8 | 49.7 |
| Video service customers | 312,555 | (4,697) | (6,760) | 35.6 | 37.1 |
| Telephony service customers | 142,754 | 489 | 5,594 | 16.2 | 16.6 |
Paragraphs:
CUSTOMER STATISTICS
(1) Excludes 251,379 primary services units (130,404 Internet services, 87,873 video services and 33,102 telephony services) from the MetroCast acquisition completed in the second quarter of fiscal 2018.
(2) As a percentage of homes passed.
(3) In the first quarter of fiscal 2019, the number of homes passed in the American broadband services segment have been adjusted upwards in order to reflect the number of non-served multi-dwelling unit passings within the footprint and consequently, the penetration as a percentage of homes passed for fiscal 2018 have also been adjusted.
INTERNET Fiscal 2019 Internet service customers net additions stood at 21,189 compared to 21,417 for the prior year as a result of: • additional connects related to the Florida expansion initiatives and in the MetroCast footprint; • our customers' ongoing interest in high speed offerings; and • growth in both the residential and business sectors.
VIDEO Fiscal 2019 video service customers net losses stood at 4,697 compared to 6,760 for the prior year mainly from: • competitive offers in the industry; and • a changing video consumption environment; partly offset by • our customers' ongoing interest in TiVo's digital advanced video services; and • the activation of bulk properties in Florida during the fourth quarter of fiscal 2019.
TELEPHONY Fiscal 2019 telephony service customers net additions stood at 489 compared to 5,594 for the prior year mainly as a result of the growth in the business sector, partly offset by a decline in the residential sector.
DISTRIBUTION OF CUSTOMERS At August 31, 2019, 52% of the American broadband services segment's customers enjoyed "double play" or "triple play" bundled services.
Question:
What was the average increase / (decrease) in internet service customers between 2018 and 2019?
Answer: (21189 + 21417) / 2 = 21303