| 2021 | 2020 | 2019 | 2018 | 2017 |
Number of shares | | | | | |
Registered par value CHF 4.20 | 69 473 243 | 69 473 243 | 69 473 243 | 69 473 243 | 69 473 243 |
Registered par value CHF 4.20 average number | 69 473 243 | 69 473 243 | 69 473 243 | 69 473 243 | 69 061 804 |
| | | | | |
Stock market prices in CHF | | | | | |
Highest | 21.5 | 14.2 | 13.5 | 18.3 | 19.1 |
Lowest | 13.6 | 5.8 | 10.0 | 10.5 | 15.1 |
31/12 | 20.6 | 14.2 | 12.6 | 10.8 | 16.3 |
| | | | | |
Stock market capitalisation in CHF million (31/12) | 1 431.1 | 986.5 | 875.4 | 750.3 | 1 128.9 |
| | | | | |
Per share data | | | | | |
Gross dividend in CHF 1 | 0.30 | 0.47 | 0.00 | 0.20 | 0.00 |
Pay-out ratio (in % of Group earnings) | 15.0 | 72.4 | 0.0 | 29.9 | 0.0 |
Group earnings in CHF 2 | 2.0 | 0.7 | 0.4 | 0.7 | 0.7 |
Cash flow from operating activities in CHF | 1.3 | 2.0 | 1.6 | 1.0 | 1.0 |
Shareholders' equity in CHF | 15.0 | 12.9 | 12.6 | 12.8 | 12.4 |
Price/earnings ratio (highest) 2 | 10.8 | 22.0 | 35.7 | 27.6 | 28.4 |
Price/earnings ratio (lowest) 2 | 6.8 | 8.9 | 26.5 | 15.8 | 22.4 |
Price/earnings ratio (31/12) 2 | 10.3 | 22.0 | 33.4 | 16.3 | 24.2 |
Price/cash flow ratio (highest) | 16.1 | 7.0 | 8.4 | 18.3 | 19.1 |
Price/cash flow ratio (lowest) | 10.2 | 2.8 | 6.2 | 10.4 | 15.1 |
Price/cash flow ratio (31/12) | 15.4 | 7.0 | 7.8 | 10.8 | 16.3 |
