Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | Name on the Register | Date listed | Location | City or town | Summary |
| --- | --- | --- | --- | --- | --- |
| 1 | Arnold Trail to Quebec | October 1, 1969\n(#69000018) | Along the Kennebec River, through Wayman and Flagstaff lakes along the Dead River and Chain of Ponds to Quebec\n44°40′49″N 69°59′18″W﻿ / ﻿44.680278°N 69.988333°W | Coburn Gore | Extends through Franklin, Kennebec, Sagadahoc, and Somerset counties |
| 2 | Barn on Lot 8, Range G | August 24, 2011\n(#11000581) | 816 Foster Hill Rd.\n44°51′29″N 70°13′20″W﻿ / ﻿44.858056°N 70.222222°W | Freeman Township |  |
| 3 | Bass Boarding House | April 7, 1988\n(#88000396) | Canal St.\n44°35′12″N 70°13′58″W﻿ / ﻿44.586667°N 70.232778°W | Wilton |  |
| 4 | Ora Blanchard House | January 15, 1980\n(#80000215) | Main St.\n45°08′32″N 70°26′42″W﻿ / ﻿45.142222°N 70.445°W | Stratton |  |
| 5 | John G. Coburn | April 11, 2002\n(#02000347) | 360 River Rd.\n44°37′36″N 70°28′36″W﻿ / ﻿44.626667°N 70.476667°W | Carthage | Perhaps the "John G. Coburn House"? |
| 6 | Coplin Plantation Schoolhouse | September 11, 1997\n(#97001132) | State Route 16 approximately 4.5 miles southwest of its junction with State Route 27\n45°05′32″N 70°29′55″W﻿ / ﻿45.092222°N 70.498611°W | Coplin Plantation |  |
| 7 | Cutler Memorial Library | November 2, 1973\n(#73000104) | Academy and High Sts.\n44°40′09″N 70°08′55″W﻿ / ﻿44.669167°N 70.148611°W | Farmington |  |
| 8 | Farmington Historic District | January 20, 1995\n(#94001551) | Roughly bounded by High, Academy, Anson, and Grove Sts.\n44°40′14″N 70°08′58″W﻿ / ﻿44.670556°N 70.149444°W | Farmington | Boundary decrease (listed 4/27/2010) |
| 9 | First Congregational Church, United Church of Christ | July 25, 1974\n(#74000149) | Main St.\n44°40′04″N 70°09′00″W﻿ / ﻿44.667778°N 70.15°W | Farmington |  |
| 10 | Franklin County Courthouse | October 6, 1983\n(#83003641) | Main and Anson Sts.\n44°40′17″N 70°09′08″W﻿ / ﻿44.671389°N 70.152222°W | Farmington |  |
| 11 | Free Will Baptist Meetinghouse | August 28, 1973\n(#73000264) | Main St.\n44°40′08″N 70°09′03″W﻿ / ﻿44.668889°N 70.150833°W | Farmington |  |
| 12 | Goodspeed Memorial Library | January 5, 1989\n(#88003019) | 104 Main St.\n44°35′16″N 70°13′51″W﻿ / ﻿44.587778°N 70.230833°W | Wilton |  |
| 13 | Greenacre | October 29, 1982\n(#82000422) | 17 Court St.\n44°40′24″N 70°08′53″W﻿ / ﻿44.673333°N 70.148056°W | Farmington |  |
| 14 | Chester Greenwood House | July 12, 1978\n(#78000160) | State Route 27\n44°39′39″N 70°08′52″W﻿ / ﻿44.660833°N 70.147778°W | Farmington |  |
| 15 | Holmes-Crafts Homestead | April 26, 1973\n(#73000105) | Old N. Jay Rd. on State Route 4\n44°31′08″N 70°13′28″W﻿ / ﻿44.518889°N 70.224444°W | North Jay |  |
| 16 | Frank Hutchins House | December 29, 1986\n(#86003532) | High St.\n44°57′05″N 70°09′54″W﻿ / ﻿44.951389°N 70.165°W | Kingfield |  |
| 17 | Jay-Niles Memorial Library | March 13, 1987\n(#87000414) | State Route 4\n44°32′53″N 70°14′17″W﻿ / ﻿44.548056°N 70.238056°W | North Jay |  |
| 18 | Little Red Schoolhouse | February 23, 1972\n(#72000070) | South of West Farmington on Wilton Rd.\n44°37′52″N 70°09′16″W﻿ / ﻿44.631111°N 70.154444°W | West Farmington |  |
| 19 | Madrid Village Schoolhouse | December 14, 1995\n(#95001460) | Western side of Reeds Mills Rd., 0.05 miles north of its junction with State Route 4\n44°51′53″N 70°27′45″W﻿ / ﻿44.864722°N 70.4625°W | Madrid |  |
| 20 | Maine Woods Office | November 10, 1980\n(#80000216) | Main St.\n44°49′27″N 70°20′55″W﻿ / ﻿44.824167°N 70.348611°W | Phillips |  |
| 21 | McCleary Farm | April 7, 1989\n(#89000253) | S. Strong Rd.\n44°45′50″N 70°12′34″W﻿ / ﻿44.763889°N 70.209444°W | Strong |  |
| 22 | Merrill Hall | January 23, 1980\n(#80000217) | Maine and Academy Sts.\n44°40′09″N 70°08′58″W﻿ / ﻿44.669167°N 70.149444°W | Farmington |  |
| 23 | New Sharon Bridge | September 24, 1999\n(#99001189) | South of U.S. Route 2 over the Sandy River\n44°38′16″N 70°00′56″W﻿ / ﻿44.637778°N 70.015556°W | New Sharon | To be demolished |
| 24 | New Sharon Congregational Church | June 20, 1985\n(#85001261) | State Route 134\n44°38′10″N 70°00′50″W﻿ / ﻿44.636111°N 70.013889°W | New Sharon |  |
| 25 | Nordica Homestead | December 23, 1969\n(#69000006) | North of Farmington on Holly Rd. off State Route 27\n44°41′42″N 70°08′43″W﻿ / ﻿44.695°N 70.145278°W | Farmington |  |
| 26 | North Jay Grange Store | October 23, 1974\n(#74000150) | State Route 17\n44°33′15″N 70°14′09″W﻿ / ﻿44.554167°N 70.235833°W | North Jay |  |
| 27 | William F. Norton House | July 8, 1982\n(#82000741) | 1 Stanley Ave.\n44°57′39″N 70°09′06″W﻿ / ﻿44.960833°N 70.151667°W | Kingfield |  |
| 28 | Old Union Meetinghouse | October 30, 1973\n(#73000106) | U.S. Route 2\n44°37′26″N 70°04′40″W﻿ / ﻿44.623889°N 70.077778°W | Farmington |  |
| 29 | Oquossoc Log Church | July 19, 1984\n(#84001368) | State Route 4\n44°58′00″N 70°46′14″W﻿ / ﻿44.966667°N 70.770556°W | Rangeley |  |
| 30 | Orgone Energy Observatory | January 29, 1999\n(#98001602) | Western side of Dodge Pond Rd., 0.65 miles north of the junction of State Routes 4/16\n44°58′54″N 70°43′05″W﻿ / ﻿44.981667°N 70.718056°W | Rangeley |  |
| 31 | Porter-Bell-Brackley Estate | November 10, 1980\n(#80000218) | Lower Main St.\n44°48′16″N 70°13′14″W﻿ / ﻿44.804444°N 70.220556°W | Strong |  |
| 32 | Hiram Ramsdell House | December 4, 1973\n(#73000107) | High and Perham Sts.\n44°40′17″N 70°08′59″W﻿ / ﻿44.671389°N 70.149722°W | Farmington |  |
| 33 | Rangeley Trust Company Building | July 13, 1989\n(#89000846) | Main St.\n44°57′50″N 70°38′32″W﻿ / ﻿44.963889°N 70.642222°W | Rangeley |  |
| 34 | Rangeley Public Library | July 12, 1978\n(#78000161) | Lake St.\n44°57′53″N 70°38′38″W﻿ / ﻿44.964722°N 70.643889°W | Rangeley |  |
| 35 | Salem Town House (Former) | August 5, 2005\n(#05000795) | State Route 142\n44°54′05″N 70°16′35″W﻿ / ﻿44.901389°N 70.276389°W | Salem |  |
| 36 | Temple Intervale School | February 8, 1985\n(#85000240) | Temple Intervale\n44°41′54″N 70°14′45″W﻿ / ﻿44.698333°N 70.245833°W | Temple |  |
| 37 | Thompson's Bridge | March 22, 1991\n(#91000321) | Over Thompson's Creek off the northern side of State Route 43 at the Franklin-Somerset county line\n44°43′36″N 70°00′25″W﻿ / ﻿44.726667°N 70.006944°W | Allen's Mills |  |
| 38 | Tufts House | May 8, 1979\n(#79000130) | Southeast of Farmington on U.S. Route 2\n44°38′10″N 70°05′35″W﻿ / ﻿44.636111°N 70.093056°W | Farmington |  |
| 39 | Union Church | July 13, 1989\n(#89000844) | Main and Pleasant Sts.\n44°49′24″N 70°20′23″W﻿ / ﻿44.823333°N 70.339722°W | Phillips |  |
| 40 | Upper Dallas School | February 9, 1990\n(#89002345) | Saddleback Rd.\n44°57′55″N 70°36′08″W﻿ / ﻿44.965278°N 70.602222°W | Dallas Plantation |  |
| 41 | Weld Town Hall | June 27, 2007\n(#07000597) | 17 School St.\n44°41′51″N 70°25′12″W﻿ / ﻿44.6975°N 70.42°W | Weld |  |
| 42 | Capt. Joel Whitney House | April 22, 2003\n(#03000293) | 8 Pleasant St.\n44°49′22″N 70°20′24″W﻿ / ﻿44.822778°N 70.34°W | Phillips |  |
| 43 | Amos G. Winter House | May 3, 1976\n(#76000191) | Winter's Hill off State Route 27\n44°57′33″N 70°09′37″W﻿ / ﻿44.959167°N 70.160278°W | Kingfield |  |
Question:
how many years difference is there between the listings for bass boarding house and ora blanchard house?
Answer:
8