What is the number of leg for ss17
{'header': ['Leg', 'Stage', 'Time (EEST)', 'Name', 'Length', 'Winner', 'Time', 'Avg. spd.', 'Rally leader'], 'page_title': '2007 Rally Finland', 'section_title': 'Special Stages', 'caption': 'Special Stages', 'rows': [['1 (2/3 Aug)', 'SS1', '20:00', 'Killeri 1', '2.50km', 'C. Atkinson', '1:20.6', '111.66km/h', 'C. Atkinson'], ['1 (2/3 Aug)', 'SS2', '07:54', 'Vellipohja 1', '17.20km', 'J. Latvala', '8:18.7', '124.16km/h', 'J. Latvala'], ['1 (2/3 Aug)', 'SS3', '08:50', 'Mökkiperä 1', '13.72km', 'M. Grönholm', '6:47.5', '121.21km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS4', '09:29', 'Palsankylä 1', '13.31km', 'M. Hirvonen', '6:47.4', '117.61km/h', 'M. Hirvonen'], ['1 (2/3 Aug)', 'SS5', '12:06', 'Vellipohja 2', '17.20km', 'M. Grönholm', '8:10.1', '126.34km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS6', '13:02', 'Mökkiperä 2', '13.72km', 'M. Hirvonen M. Grönholm', '6:42.7', '122.65km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS7', '13:41', 'Palsankylä 2', '13.31km', 'M. Grönholm', '6:36.1', '120.97km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS8', '16:21', 'Urria', '9.96km', 'M. Grönholm', '4:36.6', '129.63km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS9', '16:51', 'Lautaperä', '8.69km', 'M. Grönholm', '3:56.7', '132.17km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS10', '17:29', 'Jukojärvi', '22.25km', 'M. Grönholm', '10:35.6', '126.02km/h', 'M. Grönholm'], ['1 (2/3 Aug)', 'SS11', '20:00', 'Killeri 2', '2.50km', 'M. Grönholm', '1:20.7', '111.52km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS12', '07:17', 'Kaipolanvuori', '13.46km', 'S. Loeb', '6:53.4', '117.21km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS13', '08:30', 'Juupajoki', '22.13km', 'M. Grönholm', '11:19.3', '117.28km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS14', '09:14', 'Ouninpohja 1', '33.00km', 'M. Grönholm', '15:35.3', '127.02km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS15', '12:15', 'Leustu', '21.27km', 'M. Grönholm', '10:12.6', '124.99km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS16', '13:24', 'Ouninpohja 2', '33.00km', 'M. Grönholm', '15:19.8', '129.16km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS17', '15:10', 'Ehikki 1', '14.88km', 'M. Grönholm', '6:52.2', '129.96km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS18', '16:23', 'Himos', '18.55km', 'M. Grönholm', '10:09.8', '109.51km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS19', '17:19', 'Ehikki 2', '14.88km', 'M. Hirvonen', '6:47.4', '131.49km/h', 'M. Grönholm'], ['2 (4 Aug)', 'SS20', '17:54', 'Surkee', '14.89km', 'M. Hirvonen', '8:13.6', '108.6km/h', 'M. Grönholm'], ['3 (5 Aug)', 'SS21', '10:15', 'Valkola', '10.38km', 'M. Grönholm', '5:35.9', '111.25km/h', 'M. Grönholm'], ['3 (5 Aug)', 'SS22', '11:07', 'Lankamaa', '22.82km', 'M. Grönholm', '11:07.2', '123.13km/h', 'M. Grönholm']]}