OSLO, April 23 (Reuters) - * Norwegian shares traded up on Monday * Oslo's benchmark index rose 0.63 pct, or 5.26 points, to 851.43 points and was up by 3.89 pct year-to-date * The broader Oslo All Share Index was up 0.67 percent * Brent crude futures, a trigger for the oil heavy Oslo Bourse, fell $0.37 to $73.69 a barrel but up from $73.1 at closing of the Oslo Bourse at Friday * Among the biggest firms on the Oslo Bourse, Statoil rose 1.01 pct, Telenor rose 0.80 pct and DNB rose 0.33 pct * Tur