读世界三大汽车生产区域比例变化图，回答问题：

简述上世纪三大汽车生产区域所占比例变化情况。
                                                                                    
                                                                                    
                                                                            。
我国充分利用比较优势，争取成为下一个汽车业转移地。试分析我国发展汽车工业的有利和不利条件。
                                                                                    
                                                                                    
                                                                              。
三大汽车生产区均在其国内形成专业化的汽车城和在全球形成汽车生产跨国公司，其如此布局的原因是                                                                             
                                                                                    
                                                                                    
                                                                              。