| 2020 | 2019 | 2018 | 2017 | 2016 |
Unit sales | 13,575 | 15,855 | 16,449 | 16,043 | 15,171 |
Housing revenue | £3,129.5m | £3,420.1m | £3,545.8m | £3,422.3m | £3,136.8m |
Average selling price | £230,534 | £215,709 | £215,563 | £213,321 | £206,765 |
Profit from operations | £862.8m | £1,036.7m | £1,091.9m | £966.1m | £778.5m |
Profit before tax | £863.1m | £1,048.1m | £1,100.0m | £977.1m | £782.8m |
Basic earnings per share | 220.7p | 269.1p | 286.3p | 258.6p | 205.6p |
Diluted earnings per share | 219.9p | 268.6p | 283.7p | 246.5p | 199.5p |
Cash return/dividend per share | 110.0p | 235.0p | 235.0p | 235.0p | 135.0p |
Net assets per share | 1,102.7p | 1,021.7p | 1,006.0p | 1,036.6p | 887.3p |
Total shareholders' equity | £3,518.4m | £3,258.3m | £3,194.5m | £3,201.6m | £2,737.4m |
Return on capital employed | 29.4% | 37.0% | 41.3% | 40.3% | 30.7% |
All figures stated before exceptional items, goodwill amortisation/impairment, legacy buildings provision and includes land creditors where applicable.
For further information on dividend payments please see our Capital Return Programme page.