TypeError in News#show_news_by_year

Showing news/show_news_by_year.rhtml where line #11 raised: 

String can't be coerced into Fixnum

Extracted source (around line #11): 

8: 				<ul>
9: 					<li><%= link_to 'News & Events', {:controller => 'news'}, :no_star => true %>
10: 						<ul>
11: 							<li><%= link_to params[:year] + ' news archive', {:action => 'show_news_by_year', :year => params[:year]}, :no_star => true %></li>
12: 						</ul>
13: 					</li>
14: 				</ul>

RAILS_ROOT: /Users/Chris/work/tox/cms

Application Trace | Framework Trace | Full Trace 
app/views/news/show_news_by_year.rhtml:11:in `+'
app/views/news/show_news_by_year.rhtml:11:in `_run_erb_47app47views47news47show_news_by_year46rhtml'
app/views/news/show_news_by_year.rhtml:1:in `_run_erb_47app47views47news47show_news_by_year46rhtml'
app/controllers/admin_controller.rb:443:in `to_html'
app/controllers/admin_controller.rb:441:in `open'
app/controllers/admin_controller.rb:441:in `to_html'
app/controllers/admin_controller.rb:436:in `each'
app/controllers/admin_controller.rb:436:in `to_html'

Request

Parameters: 

{"id"=>nil,
 "year"=>2007}

Show session dump

Response

Headers: 

{"Status"=>"200 OK",
 "Content-Type"=>"text/html; charset=utf-8",
 "X-Runtime"=>"0.59813",
 "cookie"=>[],
 "Cache-Control"=>"no-cache"}